Into the Impossible With Brian Keating Sean Carroll: Quantum Mechanics and the Many Worlds Interpretation
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Aug 1, 2024 
In this engaging discussion, renowned theoretical physicist Sean Carroll takes us through the mind-bending world of quantum mechanics and the Many Worlds interpretation. He breaks down how this theory redefines our understanding of reality, suggesting that all possible outcomes exist in separate universes. Carroll highlights the importance of challenging classical assumptions, discusses potential experiments to test these ideas, and shares insights from his writing process. He also touches on his diverse interests outside of physics, making complex science relatable and captivating.
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Three-Part Structure And Quantum-First Gravity
- Carroll structures the book in three parts: basics of quantum mechanics, a deep dive into Many-Worlds, and implications for quantum gravity.
- He argues Many-Worlds thinking helps progress toward a quantum-first approach to gravity rather than quantizing classical theories.
Why The Classical World Emerges Is The Puzzle
- Quantum mechanics isn't just a 'theory of the very small' but becomes necessary for certain questions, while classical physics is an emergent approximation.
- Carroll highlights the puzzle of why a classical world emerges at all and says the laws must be special to allow it.
Begin With Quantum Theory, Not Classical Quantization
- Start research with purely quantum theories instead of quantizing a preexisting classical theory.
- Doing so might reveal how space, time, and gravity emerge rather than forcing quantization of relativity.